/*    $OpenBSD: vsnprintf.c,v 1.12 2006/01/06 18:53:04 millert Exp $ */
/************************************************************************
 * Copyright (c) 1990, 1993
 *    The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Chris Torek.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 ************************************************************************/


#include "limits.h"
#include "stdio.h"
#include "string.h"
#include "local.h"

int
vsnprintf(char *str, size_t n, const char *fmt, va_list ap)
{
    int ret;
    char dummy;
    FILE f;
    struct __sfileext fext;

    _FILEEXT_SETUP(&f, &fext);

    /* While snprintf(3) specifies size_t stdio uses an int internally */
    if (n > INT_MAX)
        n = INT_MAX;
    /* Stdio internals do not deal correctly with zero length buffer */
    if (n == 0) {
        str = &dummy;
        n = 1;
    }
    f._file = -1;
    f._flags = __SWR | __SSTR;
    f._bf._base = f._p = (unsigned char *)str;
    f._bf._size = f._w = n - 1;
    ret = __vfprintf(&f, fmt, ap);
    *f._p = '\0';
    return (ret);
}
